EP2807760A1 - Verfahren zur auswahl von vorcodierungsvektoren für mehrpunkt-mimo-kommunikation und zugehörige drahtlose endgeräte sowie funknetzwerkknoten - Google Patents

Verfahren zur auswahl von vorcodierungsvektoren für mehrpunkt-mimo-kommunikation und zugehörige drahtlose endgeräte sowie funknetzwerkknoten

Info

Publication number
EP2807760A1
EP2807760A1 EP13703159.7A EP13703159A EP2807760A1 EP 2807760 A1 EP2807760 A1 EP 2807760A1 EP 13703159 A EP13703159 A EP 13703159A EP 2807760 A1 EP2807760 A1 EP 2807760A1
Authority
EP
European Patent Office
Prior art keywords
wireless terminal
base station
sector antenna
antenna array
precoding vectors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13703159.7A
Other languages
English (en)
French (fr)
Inventor
Sairamesh Nammi
Peter VON WRYCZA
Qingyu Miao
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP2807760A1 publication Critical patent/EP2807760A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0491—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more sectors, i.e. sector diversity
    • H04B7/0495—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more sectors, i.e. sector diversity using overlapping sectors in the same base station to implement MIMO for antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]

Definitions

  • the present disclosure is directed to wireless communications and, more particularly, to Multi-Point wireless communications and related network nodes and wireless terminals.
  • wireless terminals also referred to as user equipment unit nodes, UEs, and/or mobile stations communicate via a radio access network (RAN) with one or more core networks.
  • the RAN covers a geographical area which is divided into cell areas, with each cell area being served by a radio base station (also referred to as a RAN node, a "NodeB", and/or enhanced NodeB "eNodeB").
  • a cell area is a geographical area where radio coverage is provided by the base station equipment at a base station site.
  • the base stations communicate through radio communication channels with UEs within range of the base stations.
  • a cell area for a base station may be divided input a plurality of sectors surrounding the base station.
  • a base station may service three 120 degree sectors surrounding the base station, and the base station may provide a respective directional transceiver and sector antenna array for each sector.
  • a base station may include three directional sector antenna arrays servicing respective 120 degree base station sectors surrounding the base station.
  • Multi-antenna techniques can significantly increase capacity, data rates, and/or reliability of a wireless communication system as discussed, for example, by Telatar in "Capacity Of Multi- Antenna Gaussian Channels" (European Transactions On
  • Performance may be improved if both the transmitter and the receiver for a base station sector are equipped with multiple antennas (e.g., an sector antenna array) to provide a multiple-input multiple-output (MIMO) communication channel(s) for the base station sector.
  • MIMO multiple-input multiple-output
  • Such systems and/or related techniques are commonly referred to as MIMO.
  • the LTE standard is currently evolving with enhanced MIMO support and MFMO antenna deployments.
  • a spatial multiplexing mode is provided for relatively high data rates in more favorable channel conditions, and a transmit diversity mode is provided for relatively high reliability (at lower data rates) in less favorable channel conditions.
  • spatial multiplexing may allow the simultaneous transmission of multiple symbol streams over the same frequency from the base station sector antenna array for the sector.
  • multiple symbol streams may be transmitted from the base station sector antenna array for the sector to the wireless terminal over the same downlink time/frequency resource element (TFRE) to provide an increased data rate.
  • transmit diversity e.g., using space-time codes
  • the same symbol stream may be transmitted from different antennas of the base station sector antenna array to the wireless terminal over the same time/frequency resource element (TFRE) to provide increased reliability of reception at the wireless terminal due to transmit diversity gain.
  • TFRE time-frequency- resource-element
  • TFRE may refer to a time-frequency-code-resource-element.
  • MP-HSDPA Multi-Point- HSDPA
  • 3 GPP 3 Generation Partnership Project
  • Intra Node-B aggregation (also referred to as intra node Multi-Point communications) occurs when different transport blocks of a data stream are transmitted from two different sectors of a same base station to a wireless terminal
  • Inter Node-B aggregation (also referred to as inter node Multi-Point communications) occurs when different transport blocks of a data stream are transmitted from sectors of different base stations to a wireless terminal.
  • MP-HSDPA may thus provide advantages of parallel data streams like MIMO where the spatially separated antennas are taken from different sectors/cells.
  • MP-HSDPA When MP-HSDPA is configured for transmission (from two cells/sectors of a same base station or from two cells/sectors of different base stations) to a MFMO capable wireless terminal with only two receive antennas, however, a maximum multiplex gain may be two (determined as the lesser of the number of transmitter antennas or receiver antennas used for the wireless link). Scheduling two streams with Multi-Point operation from the same sector/cell during Multi-Point communications from different sectors/cells may thus result in a loss in wireless terminal and/or sector throughput.
  • Use of MP-HSDPA with two MIMO streams from the same sector/cell may not provide useful gains in throughput, and in fact, use of MP-HSDPA with two MIMO streams from the same sector/cell may result in a loss in sector throughput.
  • a wireless terminal may receive multiple-input-multiple-output (MIMO) downlink communications from a wireless network including a plurality of base station sector antenna arrays using a codebook of precoding vectors. Responsive to receiving the MIMO downlink
  • MIMO multiple-input-multiple-output
  • a precoding vector may be selected for the multi-point MIMO downlink communications from only a subset of the precoding vectors of the codebook. Stated in other words, selection of the precoding vector may be restricted to only the subset of the precoding vectors during multipoint downlink communications.
  • a precoding vector may be selected for the single-point MIMO downlink communications from any of the precoding vectors of the codebook.
  • the precoding vector may be selected without restriction.
  • a wireless communication network including a plurality of base station sector antenna arrays may provide multiple-input- multiple-output (MIMO) downlink communications using a codebook of precoding vectors.
  • a node of the network may transmit MIMO downlink communications from the wireless communication network to a wireless terminal.
  • Responsive to transmitting the MIMO downlink communications as multi-point MIMO downlink communications from first and second base station sector antenna arrays of the plurality of base station sector antenna arrays to the wireless terminal Responsive to transmitting the MIMO downlink communications as multi-point MIMO downlink communications from first and second base station sector antenna arrays of the plurality of base station sector antenna arrays to the wireless terminal, a precoding vector may be selected for the multi-point MIMO downlink communications from only a subset of the precoding vectors of the codebook. Stated in other words, selection of the precoding vector may be restricted to only the subset of the precoding vectors during multi-point downlink communications.
  • a precoding vector may be selected for the single-point MIMO downlink communications from any of the precoding vectors of the codebook.
  • the precoding vector may be selected without restriction.
  • a wireless terminal may include an antenna array, a transceiver coupled to the antenna array, and a processor coupled to the transceiver.
  • the antenna array may include a plurality of multiple-input-multiple-output (MIMO) antenna elements
  • the transceiver may be configured to receive MIMO downlink communications through the antenna array from at least one of a plurality of base station sector antenna arrays of a wireless network using a codebook of precoding vectors.
  • the processor may be configured to select a precoding vector for downlink communications from only a subset of the precoding vectors of the codebook responsive to receiving the MIMO downlink communications as multi-point MIMO downlink communications from first and second base station sector antenna arrays.
  • a wireless communication network node may provide multiple-input-multiple-output (MIMO) downlink communications.
  • the node may include first and second sector antenna arrays for different sectors of the node, with each of the first and second sector antenna arrays including a plurality of MIMO antenna elements.
  • a first transceiver may be coupled to the first sector antenna array, and the first transceiver may be configured to transmit MIMO downlink communications through the first sector antenna array using a codebook of precoding vectors.
  • a second transceiver may be coupled to the second sector antenna array, and the second transceiver may be configured to transmit MIMO downlink communications through the second sector antenna array using the codebook of precoding vectors.
  • a processor may be coupled to the first and second transceivers, and the processor may be configured to transmit MIMO downlink
  • the processor may be further configured to select a precoding vector from only a subset of the precoding vectors of the codebook responsive to transmitting the MIMO downlink communications to the wireless terminal as multi-point MEVIO downlink communications from the first and second sector antenna arrays.
  • any precoding vector of rank 1 or higher may be selected when the wireless terminal is receiving single-point MIMO downlink transmissions from only one sector antenna array, and spatial multiplexing from a sector antenna array may be allowed for single-point MEVIO downlink transmissions.
  • Figures 1A and IB are block diagrams of communication systems that are configured according to some embodiments
  • Figures 2A, 2B, 2C, and 2D are block diagrams respectively illustrating a base station, a base station controller, a radio network controller, and a wireless terminal according to some embodiments of Figures 1 A and/or IB;
  • Figures 3 A and 3B are schematic diagrams respectively illustrating intra node and inter node Multi-Point communications according to some embodiments
  • Figure 4A is a flow chart illustrating operations of wireless terminals providing Multi-Point HSDPA communications according to some embodiments
  • Figure 4B is a flow chart illustrating operations of base stations providing Multi-Point HSDPA communications according to some embodiments;
  • Figure 5 is a flow chart illustrating operations of a wireless terminal computing/reporting channel quality information according to some embodiments;
  • Figure 6 is a flow chart illustrating operations of a base station computing CQI
  • selecting precoding vectors e.g., selecting precoding vectors
  • Figure 7 is a graph illustrating simulated network performance in terms of mean user throughput gains for rank-1 only transmissions according to some embodiments
  • Figure 8 is a graph illustrating simulated network performance in terms of mean user throughput gains for rank-1 and rank-2 transmissions according to some embodiments
  • Figure 9 is a graph illustrating simulated network performance in terms of average user throughput for all wireless terminals (UEs) vs. mean number of users per sector for PA3 channel without MF operation according to some embodiments;
  • Figure 10 is a graph illustrating simulated network performance in terms of average user throughput in Mbps for all wireless terminals (UEs) vs. mean number of users per sector with MF operation for PA3 channel according to some embodiments;
  • Figure 11 is a graph illustrating simulated network performance in terms of average user burst rate for soft handover wireless terminals (UEs) vs. mean number of users per sector without MF operation for PA3 channel according to some embodiments;
  • UEs soft handover wireless terminals
  • Figure 12 is a graph illustrating simulated network performance in terms of average user burst rate for soft handover UEs vs. mean number of users per sector with Intra + Inter base station (Node B) MF operation for PA3 channel according to some
  • Figure 13 is a graph illustrating simulated network performance in terms of average burst rate for all the wireless terminals (UEs) with burst traffic without MF operation according to some embodiments;
  • Figure 14 is a graph illustrating simulated network performance in terms of average burst rate for all the wireless terminals (UEs) with burst traffic with MF operation according to some embodiments;
  • Figure 15 is a graph illustrating simulated network performance in terms of average burst rate for soft/softer users with burst traffic without MF operation according to some embodiments
  • Figure 16 is a graph illustrating simulated network performance in terms of average burst rate for soft/softer users with burst traffic with MF operation according to some embodiments;
  • Figures 17 A, 17B, 17C, and 17D are tables of system level simulation parameters according to some embodiments;
  • Figure 18 is a table illustrating relative simulated gains compared to baseline
  • a wireless terminal also referred to as a UE
  • a wireless terminal can include any device that receives data from a communication network, and may include, but is not limited to, a mobile telephone ("cellular" telephone), laptop/portable computer, pocket computer, hand-held computer, and/or desktop computer.
  • cellular mobile telephone
  • a radio network controller also sometimes termed a base station controller (BSC) supervises and coordinates various activities of the plural base stations connected thereto.
  • the radio network controller is typically connected to one or more core networks.
  • the Universal Mobile Telecommunications System is a third generation mobile communication system, which evolved from the Global System for Mobile Communications (GSM), and is intended to provide improved mobile communication services based on Wideband Code Division Multiple Access (WCDMA) technology.
  • GSM Global System for Mobile Communications
  • WCDMA Wideband Code Division Multiple Access
  • UTRAN short for UMTS Terrestrial Radio Access Network, is a collective term for the Node B's and Radio Network Controllers which make up the UMTS radio access network.
  • UTRAN is essentially a radio access network using wideband code division multiple access for UEs.
  • the Third Generation Partnership Project (3 GPP) has undertaken to further evolve the UTRAN and GSM based radio access network technologies.
  • specifications for the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) are ongoing within 3 GPP.
  • the Evolved Universal Terrestrial Radio Access Network (E- UTRAN) comprises the Long Term Evolution (LTE) and System Architecture Evolution
  • LTE Long Term Evolution
  • WiMax Worldwide Interoperability for Microwave Access
  • UMB User Mobile Broadband
  • HSDPA High-Speed Downlink Packet Access
  • GSM Global System for Mobile Communications
  • base station also referred to as eNodeB or
  • Evolved Node B and wireless terminal also referred to as UE or User Equipment
  • UE User Equipment
  • a base station e.g., an "eNodeB”
  • UE wireless terminal
  • a base station e.g., an "eNodeB”
  • UE wireless terminal
  • a base station e.g., an "eNodeB”
  • UE wireless terminal
  • a base station e.g., an "eNodeB”
  • UE wireless terminal
  • embodiments discussed herein may focus on wireless transmissions in a downlink from an eNodeB to a UE, embodiments of present inventive concepts may also be applied, for example, in the uplink.
  • FIG. 1 A is a block diagram of a communication system that is configured to operate according to some embodiments of present inventive concepts.
  • An example RAN 60a is shown that may be a Long Term Evolution (LTE) RAN.
  • Radio base stations (e.g., eNodeB s) 100a may be connected directly to one or more core networks 70a.
  • functionality of a radio network controlled s may be performed by radio base stations 100a.
  • Radio base stations 100a communicate over wireless channels 300a with wireless terminals (also referred to as user equipment nodes or UEs) 200a that are within their respective communication service cells (also referred to as coverage areas).
  • the radio base stations 100a can communicate with one another through an X2 interface and with the core network(s) 70a through SI interfaces, as is well known to one who is skilled in the art.
  • FIG. IB is a block diagram of a communication system that is configured to operate according to some other embodiments of present inventive concepts.
  • An example RAN 60b is shown that may be a WCDMA RAN.
  • Radio base stations (e.g., NodeBs) 100b may be coupled to core network(s) 70b through one or more radio network controllers (RNCs) 65b.
  • RNCs radio network controllers
  • functionality of a radio network controller(s) may be performed by radio base stations 100b.
  • Radio base stations 100b communicate over wireless channels 300b with wireless terminals (also referred to as user equipment nodes or UEs) 200b that are within their respective communication service cells (also referred to as coverage areas).
  • the radio base stations 100b can communicate with one another and with the core network(s) 70b, as is well known to one who is skilled in the art.
  • FIG. 2A is a block diagram of a base station 100 (e.g., base station 100a and/or 100b) of Figure 1 A and/or Figure IB configured to provide service over three 120 degree sectors (sectors A, B, and C) surrounding the base station according to some embodiments.
  • base station 100 may include three transceivers 109a, 109b, and 109c coupled between base station controller 101 and respective sector antenna arrays 117a, 117b, and 117c (each of which may include multiple MIMO antennas), and memory 118 coupled to processor 101.
  • each transceiver 109 may include a receiver and a transmitter.
  • Each receiver may be configured to generate digital data streams corresponding to one or more transport blocks received through the respective sector antenna array 117 from wireless terminals 200 located in a sector serviced by the respective sector antenna array.
  • Each transmitter may be configured to transmit one or more transport blocks through the respective sector antenna array 117 to wireless terminals 200 located in the sector serviced by the sector antenna array responsive to a digital data stream from processor 101.
  • base station 100 of Figure 1 may define three 120 degree sectors A, B, and C surrounding the base station, transceiver 109a and sector antenna array 117a may support MIMO
  • transceiver 109b and sector antenna array 117b may support MFMO communications for wireless terminals 200 in sector B of base station 100
  • transceiver 109c and sector antenna array 117c may support MFMO communications for wireless terminals 200 in sector C of base station 100.
  • FIG. 2B is a block diagram of base station controller 101 of Figure 2A according to some embodiments.
  • base station controller 101 may include processor 141, network interface 143, and transceiver interface 145.
  • Network interface 143 may provide a communications interface between processor 141 and core network 70, between processor 141 and RNC 121, and/or between processor 141 and other base stations 100.
  • Transceiver interface 145 may be configured to provide a communications interface between processor 141 and each of transceivers 109a, 109b, and 109c.
  • FIG. 2C is a block diagram of a radio network controller (RNC) 121 of
  • RCN 121 may include processor 131 and network interface 135.
  • Network interface 143 may provide a
  • RNC 121 may be included in base station 100 (e.g., in one or more of base stations 100a and/or 100b).
  • FIG 2D is a block diagram of a wireless terminal (UE) 200 (e.g., wireless terminal 200a and/or 200b) of Figure 1 A and/or Figure IB according to some embodiments.
  • Wireless terminal 200 may be a cellular radiotelephone, a smart phone, a laptop/netbook/tablet/handheld computer, or any other device providing wireless
  • Wireless terminal 200 may include processor 201, user interface 211 (e.g., including a visual display such as an liquid crystal display, a touch sensitive visual display, a keypad, a speaker, a microphone, etc.), memory 218, transceiver 209, and antenna array 217 (including a plurality of antenna elements).
  • transceiver 209 may include a receiver allowing processor 201 to receive data from radio access network 60 over one or more wireless channels 300 through antenna array 217 and transceiver 209
  • transceiver 209 may include a transmitter allowing processor 201 to transmit data through transceiver 209 and antenna array 217 over one or more wireless channels 300 to radio access network 60.
  • wireless terminal 200 may receive MIMO communications allowing spatial multiplexing and/or diversity gain as discussed above.
  • a maximum number of downlink MTMO channels that may be received simultaneously during multi-point and/or single-point MTMO by wireless terminal 200 may be equal to the number of antenna elements included in antenna array 217.
  • antenna array 217 may include two antenna elements, and wireless terminal 200 may be limited to receiving no more that 2 MIMO downlink steams simultaneously.
  • wireless terminal 200 may receive up to two MEVIO downlink data streams simultaneously from a same sector antenna array of RAN 60.
  • wireless terminal 200 may receive a first MIMO downlink data stream from a first sector antenna array of RAN 60 and a second MIMO downlink data stream from a second sector antenna array of RAN 60.
  • RNC 121 may split out different downlink data streams from core network 70 to respective base stations 100 for transmission to wireless terminals 200 in communication with the respective base stations 100.
  • the base station controller 101 may split out different ones of the downlink data streams for transmission through the transceivers and sector antenna arrays of the respective sectors A, B, and C to wireless terminals 200 communicating through the respective sectors of the base station.
  • base station controller 101 may combine the different uplink data streams received through the sector antenna arrays of sectors A, B, and C.
  • RNC 121 may combine the uplink data streams from the different base stations 100, and transmit the combined uplink data streams to core network 70.
  • a downlink data stream for a particular wireless terminal 200 may thus include a plurality of transport blocks provided from core network 70 through radio network controller 121, through base station controller 101 of the base station 100 with which the wireless terminal 200 is communicating, and through the transceiver 109 and sector antenna array 117 for the sector in which the wireless terminal 200 is located.
  • processor 131 of RNC 121 may direct the downlink transport block to a respective base station 100
  • processor 141 of base station controller 101 may direct the downlink transport block to a respective transceiver and sector antenna array for transmission over the appropriate sector.
  • transport blocks from the same downlink stream may be transmitted from sector antenna arrays of the two different sectors to the wireless terminal to provide increased throughput using multi-point communications (e.g., using MP-HSDPA).
  • processor 141 of base station controller 101 may split the transport blocks of the downlink data stream to the different transceivers 109 supporting the different sectors to provide intra node aggregation as discussed in greater detail below with respect to Figure 3 A.
  • processor 131 of RNC 121 may split the transport blocks of the downlink data stream to the different base stations 100 supporting the different sectors to provide inter node aggregation as discussed in greater detail below with respect to Figure 3B.
  • base station 100 of Figure 2A may support communications with wireless terminals in three different 120 degree sectors A, B, and C. More particularly, transceiver 109a and sector antenna array 117a may support MIMO communications with wireless terminals located in Sector A, transceiver 109b and sector antenna array 117b may support MIMO communications with wireless terminals located in Sector B, and transceiver 109c and sector antenna array 117c may support MIMO
  • each of sector antenna arrays 117a, 117b, and 117c (together with respective transceivers 109a, 109b, and 109c) defines a respective 120 degree sector A, B, and C.
  • RAN 60 may provide wireless communications for a downlink data stream (made up of transport blocks) by transmitting transport blocks of the downlink data stream through transceiver 109a and sector antenna array 117a over a wireless channel 300 to wireless terminal 200.
  • intra node Multi-Point communications may be used to transmit different transport blocks of the downlink data stream in parallel through transceiver 109a and sector antenna array 117a and through transceiver 109b and sector antenna array 117b to wireless terminal 200 (e.g., using MP-HSDPA). More particularly, different first and second transport blocks of the same data stream may be respectively transmitted from sector antenna arrays 117a and 117b using a same time/frequency resource element (TFRE) to increase downlink throughput for the wireless terminal in the border area (also referred to as a soft handover region).
  • TFRE time/frequency resource element
  • the term time/frequency resource element may refer to a time/frequency/code resource element.
  • wireless terminal 200 When wireless terminal 200 is in a border area between two sectors A and B of the same base station 100 as shown in Figure 3 A, all transport blocks for the data stream to the wireless terminal 200 may be processed through a single base station controller 101 where the decision is made for each transport block of the data stream whether to transmit through sector antenna array 117a or 117b. Stated in other words, only one Radio Link Control (RLC) flow is required for the data stream with the data split being performed at a Media Access Control (MAC) layer using processor 141 of base station controller 101. With intra node Multi-Point communications as shown in Figure 3 A, the data split may be transparent with respect to RNC 121.
  • RLC Radio Link Control
  • MAC Media Access Control
  • processor 141 of base station controller 101 may decide whether to provide Multi-Point communications for wireless terminal 200.
  • processor 141 of base station controller 101 may decide whether to provide Multi-Point communications for wireless terminal 200.
  • the decision to provide Multi-Point communications may be based on a communication load in sector A and/or sector B.
  • FIG. 1 illustrates operations of wireless terminal 200
  • Figure 4B illustrates operations of RAN 60 base station 100.
  • Wireless terminal 200 may initially be located in a central portion of sector A (also referred to as a primary sector), and processor 141 of base station controller 101 may transmit transport blocks of a data stream through transceiver interface 145, transceiver 109a, and sector antenna array 117a (also referred to as a primary sector antenna array) for sector A to wireless terminal 200 (without providing Multi-Point communications).
  • Wireless terminal 200 processor 201 may receive these Single-Point communications from sector antenna array 117a through antenna array 217 and transceiver 209. Such single-point downlink communications may be provided at blocks 401a and 401b for wireless terminal 200 as long as wireless terminal 200 remains in central portions of sector A at blocks 401a, 401b, and 402a.
  • wireless terminal 200 processor 201 may transmit a notification of entry into the border area (e.g., a Radio Resource Control Event 1 A message or an RRC-1 A message) through transceiver 209 and antenna array 217 to RAN 60 at block 403a.
  • Wireless terminal 200 processor 201 may monitor control signals transmitted from sector antenna arrays 117a-c of base station 100 and/or from sector antenna arrays of other base stations, and measures of relative signal strengths of these control signals may be used by wireless terminal 200 processor 201 to determine sectors and/or sector antenna arrays suitable for communication.
  • processor 141 of base station controller 101 may identify sector B as a secondary sector for communication with wireless terminal 200.
  • the notification e.g., the RRC-1 A message
  • the notification may identify the primary and secondary sectors and/or sector antenna arrays that may be available for Multi-Point communications in the border area.
  • base station processor 141 may transmit information (e.g., a
  • Radio Resource Control Active Set Update message or RRC-ASU message to set up Multi- Point communications with wireless terminal 200 in the border area between sectors A and sector B, and the information (e.g., RRC-ASU) may be received at wireless terminal 200 at block 405a.
  • Base station processor 141 may transmit the information (e.g., RRC-ASU message) through transceiver interface 145, transceiver 109a, and sector antenna array 117a to wireless terminal 200, and the information may be received at wireless terminal processor 201 through antenna array 217 and transceiver 209.
  • wireless terminal 200 processor 201 may respond at block 407a with a communication (e.g., a Radio Resource Control Active Set Update Complete message or RRC-ASU complete message) to confirm that the wireless terminal 200 is ready to receive Multi-Point communications.
  • Wireless terminal processor 201 may transmit the communication (e.g., the RRC-ASU complete message) through transceiver 209 and antenna array 217 to base station 100.
  • base station processor 141 and wireless terminal processor 201 may provide Multi-Point communications for wireless terminal 200 at blocks 409a and 409b. More particularly, processor 141 may transmit some transport blocks of the data stream through transceiver interface 145, transceiver 109a and sector antenna array 117a to wireless terminal 200 while transmitting other transport blocks of the data stream through transceiver interface 145, transceiver 109b, and sector antenna array 117b to wireless terminal 200.
  • the communication e.g., RRC-ASU complete message
  • base station processor 141 and wireless terminal processor 201 may provide Multi-Point communications for wireless terminal 200 at blocks 409a and 409b. More particularly, processor 141 may transmit some transport blocks of the data stream through transceiver interface 145, transceiver 109a and sector antenna array 117a to wireless terminal 200 while transmitting other transport blocks of the data stream through transceiver interface 145, transceiver 109b, and sector antenna array 117b to wireless terminal 200.
  • first and second different transport blocks of the same data stream may be respectively transmitted from sector antenna array 117a and from sector antenna array 117b to wireless terminal 200 using a same frequency during a same time interval (e.g., using a same TFRE).
  • Wireless terminal processor 201 may receive these transport blocks through antenna array 217 and transceiver 209.
  • base station processor 141 and wireless terminal processor 201 may continue providing Multi-Point communications for wireless terminal 200 at blocks 409a and 409b.
  • wireless terminal 200 processor 201 may monitor control signals and/or signal strengths thereof to determine base station sector antenna arrays and/or sectors suitable for communication. If wireless terminal 200 leaves the border area between sectors A and B at block 410a, wireless terminal processor 201 may transmit a notification of exit from the border area (e.g., a Radio Resource Control IB message or RRC- 1B message) at block 41 la through transceiver 209 and antenna array 217. Upon receipt of such an exit notification at block 41 lb, processor 141 may terminate Multi-Point
  • the exit notification may identify the sector and/or sector antenna array from which single-point communications may be provided.
  • base stations 100' two base stations, identified as base stations 100' and
  • each base station 100' and 100" may support communications with wireless terminals, with each of base stations 100' and 100" separately having the structure of Figure 2 A (using prime and double prime notation to separately identify elements of the different base stations 100' and 100").
  • each base station 100' and 100" may be coupled to RNC 121.
  • base stations 100' may support MFMO communications with wireless terminals located in 120 degree sectors A', B', and C surrounding base station 100'
  • base station 100" may support MFMO communications with wireless terminals located in 120 degree sectors A", B", and C" surrounding base station 100".
  • transceiver 109a' and sector antenna array 117a' may support MIMO communications with wireless terminals located in Sector A'
  • transceiver 109b' and sector antenna array 117b' may support MIMO
  • transceiver 109c' and sector antenna array 117c' may support MFMO communications with wireless terminals located in Sector C.
  • transceiver 109a" and sector antenna array 117a' may support MFMO communications with wireless terminals located in Sector A
  • transceiver 109b" and sector antenna array 117b" may support MIMO communications with wireless terminals located in Sector B
  • transceiver 109c" and sector antenna array 117c" may support MEVIO communications with wireless terminals located in Sector C".
  • RAN 60 may provide wireless communications for a downlink data stream made up of transport blocks by transmitting the downlink data stream through transceiver 109a' and sector antenna array 117a' over a wireless channel 300 to wireless terminal 200.
  • inter node Multi-Point communications may be used to transmit different transport blocks of the downlink data stream in parallel through transceiver 109a' and sector antenna array 117a' of base station 100' and through transceiver 109b" and sector antenna array 117b" of base station 100" to wireless terminal 200 (e.g., using MP-HSDPA). More particularly, different first and second transport blocks of the same data stream may be respectively transmitted from sector antenna arrays 1 17a' and 117b" using a same
  • Multi-Point communications may be used to transmit the same transport block from sector antenna arrays 117a' and 117b" using a same TFRE to provide increased reliability of reception due to diversity gain.
  • all transport blocks for the data stream to the wireless terminal 200 may be processed through a single radio network controller (RNC) 121 where the decision is made by processor 131 for each transport block of the data stream whether to transmit through sector antenna array 117a' of base station 100' or sector antenna array 117b" of base station 100".
  • RNC radio network controller
  • Timing mismatch may occur because schedulers of base stations 100' and 100" may act independently and/or because transmission delays between wireless terminal 200 and base stations 100' and 100" may be different (due to different distances between wireless terminal 200 and base stations 100' and 100").
  • processor 131 of radio network controller 121 may decide whether to provide Multi-Point communications based on a load of sector B". As discussed, for example, in U.S. Patent Application No. 13/328, 139 (entitled “Methods Providing Multipoint Communications Based on Sector Loads and Related Network Nodes") to Nammi et al. and filed December 16, 2011, the decision to provide Multi-Point
  • communications may be based on a communication load in sector A' and/or sector B".
  • Figure 4 A illustrates operations of wireless terminal 200
  • Figure 4B illustrates operations of RAN 60 including base stations 100' and 100" and RNC 121.
  • Wireless terminal 200 may initially be located in a central portion of sector A' (also referred to as a primary sector) of base station 100', and processor 131 of RNC 121 may transmit transport blocks of a data stream through network interface 135, base station controller 101 ', transceiver 109a', and sector antenna array 117a' (also referred to as a primary sector antenna array) for sector A' to wireless terminal 200 (without providing Multi-Point communications).
  • Wireless terminal processor 201 may receive these single-point from sector antenna array 117a' through antenna array 217 and transceiver 209. Such single-point communications may be provided for wireless terminal 200 as long as wireless terminal 200 remains in central portions of sector A' at blocks 401a, 401b, and 402a.
  • wireless terminal 200 may transmit a notification of entry into the border area (e.g., a Radio Resource Control Event 1 A message or an RRC-IA message) through transceiver 209 and antenna array 217 to RAN 60 at block 403a.
  • a notification of entry into the border area e.g., a Radio Resource Control Event 1 A message or an RRC-IA message
  • Wireless terminal 200 processor 201 may monitor control signals transmitted from sector antenna arrays 117a'-c' and 117a"-c" of base stations 100' and 100" and/or from sector antenna arrays of other base stations, and measures of relative signal strengths of these control signals may be used by wireless terminal 200 to determine base stations, sectors and/or sector antenna arrays suitable for communication. If such a notification (e.g., an RRC-IA message) is received from wireless terminal 200 at base station 100' (through sector antenna array 117a', transceiver 109a', and base station controller 101 ') and/or at base station 100"
  • a notification e.g., an RRC-IA message
  • processor 131 of RNC 121 may identify sector B" of base station 100" as a secondary sector for communication with wireless terminal 200.
  • the notification e.g., the RRC-IA message
  • the notification may identify the primary and secondary base stations, sectors, and/or sector antenna arrays that may be available for Multi- Point communications in the border area.
  • processor 131 may transmit information (e.g., a Radio
  • RRC-ASU message Resource Control Active Set Update message or RRC-ASU message
  • Processor 131 may transmit the information (e.g., RRC-ASU message) through network interface 145, base station controller 10 , transceiver 109a', and sector antenna array 117a' to wireless terminal 200, and processor 201 may receive the information through antenna array 217 and transceiver 209.
  • wireless terminal 200 may respond with a communication (e.g., a Radio Resource Control Active Set Update Complete message or RRC-ASU complete message) to confirm that the wireless terminal 200 is ready to receive Multi-Point communications.
  • Wireless terminal processor 201 may transmit the communication through transceiver 209 and antenna array 217 to base station(s) 100' and/or 100".
  • RNC processor 131 and wireless terminal processor 201 may provide Multi-Point communications for wireless terminal 200 at blocks 409a and 409b. More particularly, processor 131 may transmit some transport blocks of the data stream through network interface 135, base station controller 101 ', transceiver 109a', and sector antenna array 117a' to wireless terminal 200 while transmitting other transport blocks of the data stream through network interface 135, base station controller 101", transceiver 109b", and sector antenna array 117b" to wireless terminal 200.
  • first and second different transport blocks of the same data stream may be respectively transmitted from sector antenna array 117a' and from sector antenna array 117b" to wireless terminal 200 using a same frequency during a same time interval (e.g., using a same TFRE).
  • a mismatch of reception times for inter node Multi-Point communications at wireless terminal 200 may be greater than a mismatch of reception times for intra node Multi-Point communications because base stations 100' and 100" may use independent schedulers and/or because a distance between mobile terminal 200 and base station 100' may be different than a distance between mobile terminal 200 and base station 100" (resulting in different transmission delays).
  • wireless terminal 200 may continue providing Multi-Point communications for wireless terminal 200 at blocks 409a, 409b, 410a, and 41 lb.
  • wireless terminal 200 may monitor control signals and/or signal strengths thereof to determine base stations, sector antenna arrays, and/or sectors suitable for communication. If wireless terminal 200 leaves the border area between sectors A' and B" at block 410a, wireless terminal 200 may transmit a notification of exit from the border area (e.g., a Radio Resource Control IB message or RRC- 1B message) at block 411a through transceiver 209 and antenna array 217.
  • a notification of exit from the border area e.g., a Radio Resource Control IB message or RRC- 1B message
  • processor 131 may terminate Multi-Point communications for wireless terminal at block 412b, and revert to providing single-point communications from only a primary sector antenna array of a primary base station at blocks 401a and 401b (e.g., sector antenna array 117a' of base station 100' if wireless terminal 200 moves into a central area of sector A' or sector antenna array 117b" of base station 100" if wireless terminal 200 moves into a central area of sector B").
  • the exit notification (e.g., an RRC-1B message) may identify the base station, sector, and/or sector antenna array from which single-point communications may be provided.
  • the primary sector antenna array (e.g., sector antenna array 117a or 117a') may transmit transport blocks for first data and control channels (e.g., a first high speed shared control channel or HS- SCCH and a first high speed physical downlink shared channel or HS-PDSCH) to wireless terminal 200
  • the secondary sector antenna array (e.g., sector antenna array 117b or 117b") may transmit transport blocks for second data and control channels (e.g., a second high speed shared control channel or HS-SCCH and a second high speed physical downlink shared channel or HS-PDSCH) to wireless terminal 200.
  • wireless terminal 200 may transmit a high speed dedicated physical control channel (HS-DPCCH) that is received by both primary and secondary sector antenna arrays.
  • HS-DPCCH high speed dedicated physical control channel
  • a codebook of precoding vectors (known at both RAN 60 and wireless terminal 200) is used to precode the different data streams (layers) transmitted from a sector antenna array(s) to the wireless terminal 200 and to decode the data streams (layers) received at wireless terminal 200.
  • the same codebook of precoding vectors may be stored in wireless terminal memory 218 and in base station memory 118.
  • wireless terminal 200 may estimate characteristics of each downlink channel to generate channel quality information (CQI), and CQI feedback from wireless terminal 200 is used by the base station (in single-point MIMO communications) or base stations (in multi-point MIMO
  • each base station sector antenna array 117 may include 4 antennas and wireless terminal antenna array 217 may include two antennas so that wireless terminal 200 may receive up to two downlink data streams (layers) from one base station sector antenna array during single-point MIMO communications at blocks 401a and 401b, or so that wireless terminal 200 may receive first and second downlink data streams (layers) from respective first and second sector antenna arrays during multi-point MIMO
  • the codebook may include rank 1 precoding vectors (used when transmitting one downlink data stream from a base station sector antenna array 117 to wireless terminal 200 in either single or multi point MIMO communications) and rank 2 precoding vectors (used when transmitting two downlink data streams from a base station sector antenna array 117 to wireless terminal 200 in single-point MIMO communications).
  • wireless terminal 200 and/or a base station 100 in communication therewith may select a precoding vector for the downlink(s) based on the current status of the downlink as a single or multi point downlink.
  • RAN 60 is providing single-point downlink communications from a single base station sector antenna array 117 as discussed above with respect blocks 401a and 401b of Figures 4A and 4B, selection of any of the precoding vectors (of rank 1 or rank 2) of the codebook may be allowed for the one downlink channel to provide spatial multiplexing from the single base station sector antenna array 117 in favorable channel conditions.
  • RAN 60 is providing multi-point downlink communications from different first and second base station sector antenna arrays as discussed above with respect to blocks 409a and 409b of Figures 4A and 4B, selection of only rank 1 precoding vectors may be allowed for the first and second downlink channels provided by the respective first and second base station sector antenna arrays.
  • FIG. 5 is a flow chart illustrating operations of wireless terminal 200 providing channel quality feedback information (CQI) according to some embodiments of present inventive concepts while providing single and multi point communications at blocks 401a and 409a of Figure 4A.
  • processor 201 may receive single or multi point MIMO downlink communications from RAN 60 through antenna array 217 and transceiver 209.
  • processor 201 may decide whether or not to report channel quality information (CQI) to RAN 60.
  • Processor 201 may report CQI periodically (i.e., at set time intervals), responsive to changes in channel quality, responsive to changes in downlink error rates, etc.
  • processor 201 may determine at block 505 whether the downlink communications are single-point downlink communications received from only one base station sector antenna array (as discussed with respect to block 401a of Figure 4A) or multipoint downlink communications received from two (or more) base station sector antenna arrays (as discussed with respect to block 409a of Figure 4A).
  • the downlink communications are single-point MIMO downlink
  • processor 201 may estimate channel characteristics for the downlink channel (from the one base station sector antenna array to wireless terminal 200), for example, using pilot symbols received over the downlink channel from the base station sector antenna array, at block 507.
  • processor 201 may use the estimated channel characteristics to compute a signal-to-noise- ratio (SNR) for each precoding vector in the precoding codebook (e.g., including rank 1 and rank 2 precoding vectors).
  • SNR signal-to-noise- ratio
  • processor 201 may use the SNRs to compute a capacity for each precoding vector in the precoding codebook (e.g., including rank 1 and rank 2 precoding vectors).
  • the capacity C for each precoding vector may be computed, for example, using the formula:
  • SNR is the computed SNR for that precoding vector.
  • Processor 201 may then select a precoding vector from all of the precoding vectors (e.g., including rank 1 and rank 2 precoding vectors) at block 515 based on the computed capacities for each of the precoding vectors.
  • Processor 201 may select a precoding vector based on the computed capacities to increase/maximize a downlink capacity.
  • processor 201 may perform link adaptation using the SNR for the selected precoding vector to select a modulation and coding scheme (e.g., using lookup tables stored in memory 218).
  • channel quality information may be transmitted to the base station transmitting the single-point MFMO downlink communications.
  • the CQI may include an index (e.g., precoding control indication or PCI) identifying the precoding vector selected at block 515, and the modulation and coding scheme selected at block 517.
  • Precoding control indication (PCI) and Channel Quality Information (CQI) are discussed, for example, in section 6A.2.2 of the technical specification 3GPP TS 25.214, VI 0.1.0 entitled "Physical Layer Procedures (FDD) (Release 10)," December 2010.
  • Processor 201 may then return to block 501 to receive downlink communication based on the channel quality information reported at block 519.
  • wireless terminal processor 201 may select any precoding vector of any rank from the codebook when receiving single-point MIMO downlink communications. Accordingly, spatial multiplexing may be provided over the single-point MIMO downlink using rank 2 precoding vectors to increase a data rate when the channel is of a sufficient quality, or diversity gain may be provided over the single-point MIMO downlink using rank 1 precoding vectors if the channel quality is not sufficient for spatial diversity.
  • the downlink communications are multi-point MIMO downlink
  • processor 201 may estimate channel characteristics for a first downlink channel from the first base station sector antenna array and for a second downlink channel from the second base station sector antenna array using, for example, using pilot symbols received over the first and second downlink channels, at block 520.
  • processor 201 may use the estimated channel characteristics for the first downlink channel to compute a signal-to-noise-ratio (S R) for each of a subset of the precoding vectors in the precoding codebook (e.g., including only rank 1 precoding vectors and excluding rank 2 precoding vectors) for the first downlink channel.
  • processor 201 may also use the estimated channel characteristics for the second downlink channel to compute a signal-to-noise-ratio (SNR) for each of the subset of the precoding vectors in the precoding codebook (e.g., including only rank 1 precoding vectors and excluding rank 2 precoding vectors) for the second downlink channel.
  • S R signal-to-noise-ratio
  • SNR signal-to-noise-ratio
  • processor 201 may use the SNRs to compute a capacity for each precoding vector in the precoding codebook of the subset (e.g., including only rank 1 precoding vectors and excluding rank 2 precoding vectors) for each downlink.
  • the capacities C may be computed, for example, using the formula:
  • Processor 201 may then select a precoding vector from the subset of precoding vectors for each downlink at block 525 based on the computed capacities for each of the subset of precoding vectors for each downlink.
  • Processor 201 may select a precoding vector for each downlink based on the computed capacities to increase/maximize a downlink capacity.
  • processor 201 may perform link adaptation using the SNR for the selected precoding vectors to select a modulation and coding scheme for each downlink (e.g., using lookup tables stored in memory 218).
  • channel quality information may be transmitted to the base station(s) transmitting the multi-point MTMO downlink communications.
  • the CQI may include first and second indices (e.g., precoding control indices or PCIs) identifying the precoding vectors selected for the downlinks at block 525, and the modulation and coding schemes selected for the downlinks at block 527.
  • Processor 201 may then return to block 501 to receive downlink communication based on the channel quality information reported at block 529.
  • wireless terminal processor 201 may select from only a subset of precoding vectors from the codebook (e.g., including only rank 1 precoding vectors and excluding rank 2 precoding vectors) when receiving multi-point MIMO downlink communications over first and second downlinks from first and second base station sector antenna arrays. Accordingly, spatial multiplexing over either of the multi-point MIMO downlinks may be blocked to reduce computational overhead, for example, when computing SNRs and/or capacities at blocks 521 and/or 523. Stated in other words, selection of precoding vectors may be restricted to lower rank (e.g., rank 1) precoding vectors when receiving multi-point downlink communications. Because higher rank (e.g., rank 2) precoding vectors may not significantly improve performance in multi-point communications (and may actually reduce performance), computational overhead may be reduced without significantly reducing performance.
  • the codebook e.g., including only rank 1 precoding vectors and excluding rank 2 precoding vectors
  • FIG. 6 is a flow chart illustrating operations of base station 100 selecting precoding vectors according to some embodiments of present inventive concepts while providing single and multi point communications at blocks 401b and 409b of Figure 4B.
  • processor 141 and/or 131 may transmit single-point MFMO downlink
  • a processor 141 of a base station 100 transmitting a single or multi point downlink communication channel to wireless terminal 200 may proceed with
  • CQI channel quality information
  • a first CQI report may include a first index and a first modulation and coding scheme for a first multi-point downlink channel and a second CQI report may include a second index and a second modulation and coding scheme for a second multi-point downlink channel.
  • a single CQI report during multi-point communications may include first and second indices and first and second modulation and coding schemes for both multi-point downlink channels.
  • the 141 may determine at block 605 whether the downlink communications with wireless terminal 200 are single-point downlink communications transmitted from only one base station sector antenna array (as discussed with respect to block 401b of Figure 4B) or multipoint downlink communications received from two (or more) base station sector antenna arrays (as discussed with respect to block 409b of Figure 4B).
  • the downlink communications are single-point MHVIO downlink
  • processor 141 may select any precoding vector from the precoding codebook as a precoding vector for the single-point downlink channel based on the rank of the precoding vector recommended by wireless terminal 200 at block 61 1. Stated in other words, base station processor 141 may select a precoding vector based on a rank recommended/requested by wireless terminal 200 (without restriction selection to a subset of precoding vectors) when single-point downlink communications are provided.
  • processor 141 may select a modulation and coding scheme corresponding to the selected precoding vector, and then return to block 601 to transmit downlink communications using the selected precoding vector and modulation and coding scheme. If the precoding vector and/or modulation and coding scheme selected at blocks 611 and/or 615 differs from the requested/recommended precoding vector and/or modulation and/or coding scheme in the CQI report from wireless terminal 200, the selected precoding vector and/or modulation and coding scheme (or an identification thereof) may be transmitted to wireless terminal 200. [0093] If the downlink communications are multi-point MIMO downlink
  • processor 141 may determine at block 621 if wireless terminal 200 recommends a precoding vector having a rank greater than 1. If the recommended precoding vector rank is not greater than 1 (e.g., rank 1), processor 141 may proceed with operations of blocks 611 and 615 as discussed above because a rank 1 precoding vector is consistent with multi-point downlink communications according to embodiments of present inventive concepts.
  • processor 141 may force precoding vector selection from a subset of the precoding vectors (e.g., rank 1 precoding vectors) of the codebook at block 623. Stated in other words, processor 141 may override wireless terminal 200 selection of a higher precoding vector rank (e.g., rank 2) during multi-point
  • processor 141 may select a modulation and coding scheme corresponding to the selected precoding vector, and then return to block 601 to transmit downlink
  • wireless terminal 200 may select and report any precoding vector and/or rank, but a base station may override higher rank selections during multi-point communications to select a suitable rank 1 precoding vector.
  • Figure 7 is a graph illustrating relative gains in a border area (referred to as a soft handover or sho area) using only rank 1 precoding vectors so that a base station sector antenna array transmits only one data stream (layer).
  • the three data lines of Figure 7 illustrate: (1) a baseline without multi-point communications (No SF-DC-HSDPA, shown by the solid line and closed circles); (2) relative gains with intra-nodeB multi-point
  • Figure 8 is a graph illustrating relative gains in a in a border area (referred to as a soft handover or sho area) allowing adaptive rank selection (i.e., allowing selection between rank 1 and rank 2 precoding vectors) according to channel characteristics.
  • a border area referred to as a soft handover or sho area
  • adaptive rank selection i.e., allowing selection between rank 1 and rank 2 precoding vectors
  • channel characteristics channel characteristics.
  • intra-nodeB multi-point communications shown by the dotted line and open circles
  • inter-nodeB multi-point communications shown by the dotted and dashed line and open squares
  • Radio Access Network # 53 (RAN#53) plenary meeting
  • a work item on multi-flow HSDPA transmission was started to improve the cell edge user experience.
  • One question that was raised during the Radio Access Network # 67 (RAN1#67) meeting is whether to support MIMO for MF-HSDPA or not. It was suggested in Rl-114016 ("MFMO in MP-HSDPA", Qualcomm, 3 GPP TSG RAN WG1 Meeting #67, San Francisco, USA, 14th- 18th November 2011) that MF-HSDPA with MIMO enabled may perform worse compared to MF-HSDPA with SIMO (single-input-multiple output) in terms of spectrum efficiency.
  • HSDPA HSDPA
  • the network may have to switch off the MIMO operation potentially causing significant loss in system throughput and link level throughput to high SNR UEs. From simulation results, loss in average system throughput of 30% due to switching from MFMO to SFMO may occur.
  • R ja and R ⁇ are set equal to 3 and 5 dB respectively, resulting in about 40% of users in soft handover region.
  • all UEs use type 3i receivers and a single link for data transfer.
  • MF operation is available for users in soft/softer handover region who use type 3i receivers.
  • Figure 9 shows the plot between average user throughput for SFMO, MIMO and MIMO with Rank 1 for different number of users per sector for PA3 channel. The throughput is plotted for all the users in Mbps. As shown, MFMO with rank adaptation may outperform SIMO and MFMO with Rank-1 only transmission. Figure 9 illustrates average user throughput for all the UEs vs. mean number of users per sector for PA3 channel without MF operation. [00104] Figure 10 shows the average user throughput for SIMO, MIMO, and ⁇ with Rankl with MF for all the UEs in Mbps with respect to a number of users in sector for PA3 channel.
  • MIMO with rank adaptation may still outperform SIMO and MFMO with Rank-1 only transmission.
  • Figure 10 illustrates average user throughput in Mbps for all the UEs vs. mean number of users per sector with MF operation for PA3 channel .
  • Softer/Soft handover user throughput numbers for the cases considered without MF operation are shown in Figure 11.
  • throughput for MIMO with Rank- 1 only transmission and MIMO with Rank adaptation may be similar and there may be insignificant gain using MFMO with rank adaptation.
  • Figure 12 shows the soft/softer handover user throughput numbers with MF operation.
  • significant gain may be provided using MFMO with Rank-1 only transmissions.
  • gains may decrease as the number of users per sector increases.
  • Figure 11 illustrates average user burst rate for soft handover UEs vs. mean number of users per sector without MF operation for PA3 channel.
  • Figure 12 shows average user burst rate for soft handover UEs vs. mean number of users per sector with Intra + Inter Node B MF operation for PA3 channel.
  • the table of Figure 18 shows gains achieved using MIMO with rank adaptation and MIMO with Rank-1 only transmission compared with SIMO without MF operation for softer/soft handover users. It can be observed that MFMO with Rank-1 may provide gives significant gains compared to that of SIMO baseline.
  • Figure 13 shows Average user burst rates for all the UE in the sector vs. offered load in the cell without MF operation. Similar to previous results with full buffer traffic, MFMO with rank adaptation may outperform SFMO and MIMO with Rank-1 only transmission. Figure 13 shows simulated average burst rates for all UEs with burst traffic without MF operation.
  • Figure 15 shows simulated average user burst rates for soft/softer handover users only for the 3 cases considered. Without MF operation, MIMO with rank adaptation and MIMO with Rank 1 only transmission performance may be similar.
  • Figure 16 shows simulated soft/softer handover user burst rates with MF operation. As shown, MFMO with Rank-1 only transmission may outperform MIMO with rank adaptation and SIMO.
  • Figure 15 shows simulated average burst rate for soft/softer users with burst traffic without MF operation.
  • Figure 16 shows average burst rate for soft/softer users with burst traffic with MF operation.
  • a wireless terminal may receive multiple-input-multiple-output (MIMO) downlink communications from a wireless network including a plurality of base station sector antenna arrays using a codebook of precoding vectors.
  • MIMO multiple-input-multiple-output
  • a precoding vector may be selected for the multi-point MFMO downlink communications from only a subset of the precoding vectors of the codebook. Stated in other words, selection of the precoding vector may be restricted to only the subset of the precoding vectors during multi-point downlink communications.
  • a precoding vector may be selected for the single-point MFMO downlink communications from any of the precoding vectors of the codebook.
  • the precoding vector may be selected without restriction.
  • a wireless communication network including a plurality of base station sector antenna arrays may provide multiple-input- multiple-output (MIMO) downlink communications using a codebook of precoding vectors.
  • a node of the network may transmit MIMO downlink communications from the wireless communication network to a wireless terminal.
  • a precoding vector may be selected for the multi-point MFMO downlink communications from only a subset of the precoding vectors of the codebook. Stated in other words, selection of the precoding vector may be restricted to only the subset of the precoding vectors during multi-point downlink communications.
  • a precoding vector may be selected for the single-point MFMO downlink communications from any of the precoding vectors of the codebook.
  • the precoding vector may be selected without restriction.
  • a wireless terminal may include an antenna array, a transceiver coupled to the antenna array, and a processor coupled to the transceiver.
  • the antenna array may include a plurality of multiple-input-multiple-output (MIMO) antenna elements
  • the transceiver may be configured to receive MIMO downlink communications through the antenna array from at least one of a plurality of base station sector antenna arrays of a wireless network using a codebook of precoding vectors.
  • the processor may be configured to select a precoding vector for downlink communications from only a subset of the precoding vectors of the codebook when receiving the MIMO downlink communications as multi-point MIMO downlink communications from first and second base station sector antenna arrays.
  • a wireless communication network node may provide multiple-input-multiple-output (MIMO) downlink communications.
  • the node may include first and second sector antenna arrays for different sectors of the node, with each of the first and second sector antenna arrays including a plurality of MIMO antenna elements.
  • a first transceiver may be coupled to the first sector antenna array, and the first transceiver may be configured to transmit MIMO downlink communications through the first sector antenna array using a codebook of precoding vectors.
  • a second transceiver may be coupled to the second sector antenna array, and the second transceiver may be configured to transmit MIMO downlink communications through the second sector antenna array using the codebook of precoding vectors.
  • a processor may be coupled to the first and second transceivers, and the processor may be configured to transmit MIMO downlink
  • the processor may be further configured to select a precoding vector from only a subset of the precoding vectors of the codebook when transmitting the MIMO downlink communications to the wireless terminal as multi-point MIMO downlink communications from the first and second sector antenna arrays.
  • any precoding vector of rank 1 or higher may be selected when the wireless terminal is receiving single-point MIMO downlink transmissions from only one sector antenna array, and spatial multiplexing from a sector antenna array may be allowed for single-point MIMO downlink transmissions.
  • a wireless terminal may receive multiple-input-multiple-output (MIMO) downlink
  • MIMO multiple-input-multiple-output
  • a precoding vector may be selected for the multi-point MIMO downlink communications from only a subset of the precoding vectors of the codebook. Stated in other words, selection of the precoding vector may be restricted to only the subset of the precoding vectors during multipoint downlink communications.
  • a precoding vector may be selected for the single-point MIMO downlink communications from any of the precoding vectors of the codebook.
  • the precoding vector may be selected without restriction.
  • a wireless communication network including a plurality of base station sector antenna arrays may provide multiple-input- multiple-output (MIMO) downlink communications using a codebook of precoding vectors.
  • a node of the network may transmit MIMO downlink communications from the wireless communication network to a wireless terminal. Responsive to transmitting the MIMO downlink communications as multi-point MIMO downlink communications from first and second base station sector antenna arrays of the plurality of base station sector antenna arrays to the wireless terminal, a precoding vector may be selected for the multi-point MIMO downlink communications from only a subset of the precoding vectors of the codebook.
  • selection of the precoding vector may be restricted to only the subset of the precoding vectors during multi-point downlink communications.
  • a precoding vector Responsive to transmitting the MIMO downlink communications as single- point MIMO downlink communications from only one base station sector antenna array, a precoding vector may be selected for the single-point MIMO downlink communications from any of the precoding vectors of the codebook. During single-point MIMO communications, the precoding vector may be selected without restriction.
  • a wireless terminal may include an antenna array, a transceiver coupled to the antenna array, and a processor coupled to the transceiver.
  • the antenna array may include a plurality of multiple-input-multiple-output (MIMO) antenna elements
  • the transceiver may be configured to receive MIMO downlink communications through the antenna array from at least one of a plurality of base station sector antenna arrays of a wireless network using a codebook of precoding vectors.
  • the processor may be configured to select a precoding vector for downlink communications from only a subset of the precoding vectors of the codebook responsive to receiving the MIMO downlink communications as multi-point MIMO downlink communications from first and second base station sector antenna arrays.
  • a wireless communication network node may provide multiple-input-multiple-output (MIMO) downlink communications.
  • the node may include first and second sector antenna arrays for different sectors of the node, with each of the first and second sector antenna arrays including a plurality of MIMO antenna elements.
  • a first transceiver may be coupled to the first sector antenna array, and the first transceiver may be configured to transmit MIMO downlink communications through the first sector antenna array using a codebook of precoding vectors.
  • a second transceiver may be coupled to the second sector antenna array, and the second transceiver may be configured to transmit MIMO downlink communications through the second sector antenna array using the codebook of precoding vectors.
  • a processor may be coupled to the first and second transceivers, and the processor may be configured to transmit MIMO downlink
  • the processor may be further configured to select a precoding vector from only a subset of the precoding vectors of the codebook responsive to transmitting the MIMO downlink communications to the wireless terminal as multi-point MIMO downlink communications from the first and second sector antenna arrays.
  • Embodiment 1 A method of operating a wireless terminal in a wireless communication network providing multiple-input-multiple-output (MIMO) downlink communications from a plurality of base station sector antenna arrays using a codebook of precoding vectors, the method comprising: receiving MIMO downlink communications from the wireless communication network; and responsive to receiving the MIMO downlink communications as multi-point MIMO downlink communications from first and second base station sector antenna arrays of the plurality of base station sector antenna arrays, selecting a precoding vector for the multi-point MIMO downlink communications from only a subset of the precoding vectors of the codebook.
  • MIMO multiple-input-multiple-output
  • Embodiment 2 The method of Embodiment 1 further comprising: responsive to receiving the MIMO downlink communications as single-point MIMO downlink communications from only one base station sector antenna array, selecting a precoding vector for the single-point MIMO downlink communications from any of the precoding vectors of the codebook.
  • Embodiment 3 The method of Embodiment 2 wherein the codebook includes rank 1 precoding vectors supporting only one layer of MIMO downlink data transmission from a base station sector antenna array and rank 2 precoding vectors supporting two layers of downlink data transmission from a base station sector antenna array, and wherein the subset of the precoding vectors includes the rank 1 precoding vectors and excludes the rank 2 precoding vectors.
  • Embodiment 4 The method of Embodiment 1 wherein selecting the precoding vector for the multi-point MIMO downlink communication comprises selecting a first precoding vector based on a downlink channel between the wireless terminal and the first base station sector antenna array and selecting a second precoding vector based on a downlink channel between the wireless terminal and the second base station sector antenna array, the method further comprising: transmitting respective first and second identifications of the respective first and second precoding vectors selected for the multi-point MIMO downlink communications.
  • Embodiment 5 The method of Embodiment 4 further comprising: responsive to receiving the MIMO downlink communications as multi-point MIMO downlink communications, estimating channel characteristics for the downlink channels between the wireless terminal and the first base station sector antenna array and between the wireless terminal and the second base station sector antenna array; responsive to receiving the MIMO downlink communications as multi-point MIMO downlink communications, computing Signal-to-Noise-Ratios, S Rs, for only the subset of the precoding vectors for the downlink channel between the wireless terminal and the first base station sector antenna array and for only the subset of the precoding vectors for the downlink channel between the wireless terminal and the second base station sector antenna array; wherein selecting the first and second precoding vectors comprises selecting the first and second precoding vectors based on the SNRs computed for only the subset of the precoding vectors.
  • S Rs Signal-to-Noise-Ratios
  • Embodiment 6 A method of operating a node in a wireless communication network, providing multiple-input-multiple-output (MIMO) downlink communications from a plurality of base station sector antenna arrays using a codebook of precoding vectors, the method comprising: transmitting MIMO downlink communications from the wireless communication network to a wireless terminal; and responsive to transmitting the MIMO downlink communications as multi-point MIMO downlink communications from first and second base station sector antenna arrays of the plurality of base station sector antenna arrays to the wireless terminal, selecting a precoding vector for the multi-point MIMO downlink communications from only a subset of the precoding vectors of the codebook.
  • MIMO multiple-input-multiple-output
  • Embodiment 7 The method of Embodiment 6 further comprising: responsive to transmitting the MIMO downlink communications as single-point MIMO downlink communications from only one base station sector antenna array, selecting a precoding vector for the single-point MIMO downlink communications from any of the precoding vectors of the codebook.
  • Embodiment 8 The method of Embodiment 7 wherein the codebook includes rank 1 precoding vectors supporting only one layer of MIMO downlink data transmission from a base station sector antenna array to the wireless terminal and rank 2 precoding vectors supporting two layers of downlink data transmission from a base station sector antenna array to the wireless terminal, and wherein the subset of the precoding vectors includes the rank 1 precoding vectors and excludes the rank 2 precoding vectors.
  • Embodiment 9 The method of Embodiment 8 further comprising: receiving channel quality information from the wireless terminal wherein the channel quality information includes an identification of a recommended rank 2 precoding vector of the codebook of precoding vectors; wherein selecting the precoding vector for the multi-point MIMO downlink communications comprises forcing selection of the precoding vector for the multi-point downlink communications from only the subset of the precoding vectors to override the recommended rank 2 precoding vector.
  • Embodiment 10 Embodiment 10.
  • selecting the precoding vector for the multi-point MTMO downlink communications comprises selecting a first precoding vector for a downlink channel between the wireless terminal and the first base station sector antenna array and selecting a second precoding vector for a downlink channel between the wireless terminal and the second base station sector antenna array.
  • a wireless terminal comprising: an antenna array including a plurality of multiple-input-multiple-output (MIMO) antenna elements; a transceiver coupled to the antenna array wherein the transceiver is configured to receive MIMO downlink communications through the antenna array from at least one of a plurality of base station sector antenna arrays of a wireless network using a codebook of precoding vectors; and a processor coupled to the transceiver wherein the processor is configured to select a precoding vector for downlink communications from only a subset of the precoding vectors of the codebook responsive to receiving the MIMO downlink communications as multi-point MIMO downlink communications from first and second base station sector antenna arrays.
  • MIMO multiple-input-multiple-output
  • Embodiment 12 The wireless terminal of Embodiment 11 wherein the processor is further configured to select a precoding vector for downlink communications from any of the precoding vectors of the codebook responsive to receiving the MIMO downlink communications as single-point MIMO downlink communications from only one base station sector antenna array.
  • Embodiment 13 The wireless terminal of Embodiment 12 wherein the codebook includes rank 1 precoding vectors supporting only one layer of MIMO downlink data transmission from a base station sector antenna array and rank 2 precoding vectors supporting two layers of downlink data transmission from a base station sector antenna array, and wherein the subset of the precoding vectors includes the rank 1 precoding vectors and excludes the rank 2 precoding vectors.
  • Embodiment 14 The wireless terminal according to Embodiment 11 wherein the processor is configured to select the precoding vector for the multi-point MIMO downlink communication by selecting a first precoding vector based on a downlink channel between the wireless terminal and the first base station sector antenna array and selecting a second precoding vector based on a downlink channel between the wireless terminal and the second base station sector antenna array, and wherein the processor is configured to transmit respective first and second identifications of the respective first and second precoding vectors through the transceiver and the antenna array.
  • a node in a wireless communication network providing multiple-input-multiple-output (MIMO) downlink communications comprising: first and second sector antenna arrays for different sectors of the node wherein each of the first and second sector antenna arrays includes a plurality of MIMO antenna elements; a first transceiver coupled to the first sector antenna array, wherein the first transceiver is configured to transmit MIMO downlink communications through the first sector antenna array using a codebook of precoding vectors; a second transceiver coupled to the second sector antenna array, wherein the second transceiver is configured to transmit MIMO downlink communications through the second sector antenna array using the codebook of precoding vectors; and a processor coupled to the first and second transceivers, wherein the processor is configured to transmit MIMO downlink communications through the first and/or second transceivers and the first and/or second sector antenna arrays to a wireless terminal, and to select a precoding vector from only a subset of the precoding vectors of the
  • Embodiment 17 The node of Embodiment 16 wherein the processor is configured to select a precoding vector from any of the precoding vectors of the codebook responsive to transmitting the MIMO downlink communications as single-point MIMO downlink communications to the wireless terminal from only one of the first and second sector antenna arrays.
  • Embodiment 18 The node of Embodiment 17 wherein the codebook includes rank 1 precoding vectors supporting only one layer of MIMO downlink data transmission from a base station sector antenna array to the wireless terminal and rank 2 precoding vectors supporting two layers of downlink data transmission from a base station sector antenna array to the wireless terminal, and wherein the subset of the precoding vectors includes the rank 1 precoding vectors and excludes the rank 2 precoding vectors.
  • Embodiment 19 The node of Embodiment 18 wherein the processor is further configured to receive channel quality information from the wireless terminal wherein the channel quality information includes an identification of a recommended rank 2 precoding vector of the codebook of precoding vectors, and to force selection of the precoding vector for the multi-point downlink communications from only the subset of the precoding vectors to override the recommended rank 2 precoding vector identified in the channel quality information from the wireless terminal.
  • the channel quality information includes an identification of a recommended rank 2 precoding vector of the codebook of precoding vectors, and to force selection of the precoding vector for the multi-point downlink communications from only the subset of the precoding vectors to override the recommended rank 2 precoding vector identified in the channel quality information from the wireless terminal.
  • Embodiment 20 The node of Embodiment 16 wherein the processor is configured to select the precoding vector by selecting a first precoding vector for a downlink channel between the wireless terminal and the first sector antenna array and selecting a second precoding vector for a downlink channel between the wireless terminal and the second sector antenna array.
  • the terms “comprise”, “comprising”, “comprises”, “include”, “including”, “includes”, “have”, “has”, “having”, or variants thereof are open-ended, and include one or more stated features, integers, elements, steps, components or functions but does not preclude the presence or addition of one or more other features, integers, elements, steps, components, functions or groups thereof.
  • the common abbreviation “e.g.”, which derives from the Latin phrase “exempli gratia” may be used to introduce or specify a general example or examples of a previously mentioned item, and is not intended to be limiting of such item.
  • the common abbreviation “i.e.”, which derives from the Latin phrase “id est,” may be used to specify a particular item from a more general recitation.
  • Example embodiments are described herein with reference to block diagrams and/or flowchart illustrations of computer-implemented methods, apparatus (systems and/or devices) and/or computer program products. It is understood that a block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions that are performed by one or more computer circuits.
  • These computer program instructions may be provided to a processor circuit of a general purpose computer circuit, special purpose computer circuit, and/or other programmable data processing circuit to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, transform and control transistors, values stored in memory locations, and other hardware components within such circuitry to implement the functions/acts specified in the block diagrams and/or flowchart block or blocks, and thereby create means (functionality) and/or structure for implementing the functions/acts specified in the block diagrams and/or flowchart block(s).
  • These computer program instructions may also be stored in a tangible computer-readable medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer- readable medium produce an article of manufacture including instructions which implement the functions/acts specified in the block diagrams and/or flowchart block or blocks.
  • a tangible, non-transitory computer-readable medium may include an electronic, magnetic, optical, electromagnetic, or semiconductor data storage system, apparatus, or device. More specific examples of the computer-readable medium would include the following: a portable computer diskette, a random access memory (RAM) circuit, a read-only memory (ROM) circuit, an erasable programmable read-only memory (EPROM or Flash memory) circuit, a portable compact disc read-only memory (CD-ROM), and a portable digital video disc read-only memory (DVD/BlueRay).
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM compact disc read-only memory
  • DVD/BlueRay portable digital video disc read-only memory
  • the computer program instructions may also be loaded onto a computer and/or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer and/or other programmable apparatus to produce a computer- implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.
  • embodiments of present inventive concepts may be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.) that runs on a processor such as a digital signal processor, which may collectively be referred to as "circuitry," "a module” or variants thereof.

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